Plant Parasites of Europe

leafminers, galls and fungi

Phyllactinia betulae

Phyllactinia betulae (de Candolle) Fuss,1878

on Betula

Phyllactinia betulae: cleistothecium on Betula pubescens

Betula pubescens, Amstelveen, Thijssepark: hypophyllous cleistothecium

Phyllactinia betulae on Betula pendula

Betula pendula, Belgium, prov. Antwerp, Mol, Buitengoor-Meergoor © Carina Van Steenwinkel

Phyllactinia betulae on Betula pendula

same leaf, underside with cleistothecia

Phyllactinia betulae: cleistothecium

cleistothecium, with aciculate appendages

Phyllactinia betuilae: asci


Phyllactinia betulae: cleistothecium

cushion of peniciillate cells on top of the cleistothecium

Phyllactinia betulae: penicillate cell

penicillate cell

Phyllactinia betulae: cleistothecia with penicillate cells on top

Betula spec., Belgium, prov. Antwerp, Balen, de Most © Carina Van Steenwinkel: the penicillate cells form a gelatinous cushion on top of the cleistothecium


mycelium hypophyllous, weak, effuse (also internal). Conidia single, clavate, without fibrosin bodies, on a long conidiophore. Cleistothecia with 10-30 asci, with two spores. Appendages 6-18, equatorial, 1-2.5 the diameter; they are acicular, stiff, with a bulbous swelling at their base.

host plants

Betulaceae, monophagous

Betula humilis, litwinowii, medwediewii, nana, papyrifera, pendula, pubescens.


P. betulae may occur together with Erysiphe ornata; look at that species for a comparison of the two.


Braun (1995a), Braun & Cook (2012a), Bresinsky (2016a), Jage, Klenke, Kruse ao (2016a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Kruse, Thiel, Rätzel, ao (2020a), Leysen (2017a), Piątek (2004a), Scheuer & Bechter (2012a).

Last modified 7.iv.2023